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NEWTOWN, Conn. (CBSNewYork/AP) — Families of the victims of last month’s mass shooting at Sandy Hook Elementary School have come together in an effort to push for change.

Sandy Hook Promise, formerly known as Newtown United, announced an initiative aimed at preventing future violent tragedies by calling for a national dialogue and action on gun control, mental health care and public safety.

“Some of us who came together to start Sandy Hook Promise are gun owners, we’re not afraid of a national conversation in our community and in Congress about responsibility and accountability,” said Tom Bittman, a co-founder of Sandy Hook Promise.

“This is a promise to truly honor the lives lost by turning our tragedy into a moment of transformation,” said Nelba Marquez-Greene, whose daughter Ana Grace Marquez-Greene was killed. “This is a promise to be open to all possibilities, there is no agenda other than to make our communities and our nation a safer, better place.”

Adam Lanza, 20, shot his way into Sandy Hook Elementary School on Dec. 14 and killed 20 first-graders and six women before committing suicide as police arrived. Lanza also killed his mother at their Newtown home before driving to the school and carrying out the massacre.